I've never had any problems with the 757 since buying it last year (v 4.2) I can't remember which version of FSUIPC it installed, but it worked fine. I'm now using FSUIPC 4.60 (registered version) without any problems. FSUIPC doesn't need to be registered for the 757 to work with it.

You could try downloading the 757-200 Base Pack again (get a new link after check-in to your profile in the support pages). That fixed a strange problem with some gauges and buttons I had with the 757-300 Expansion Model (which seemed not be installing everything needed).

Mark.